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## Homework Statement

A 4.0-kg oak block on a horizontal, rough oak surface is attached by a light string that passes over a light, frictionless pulley to a hanging 2.0-kg object. The magnitude of the force of friction on the 4.0-kg block is 11.8 N.

http://img353.imageshack.us/img353/3743/pulleyai7.jpg [Broken]

## Homework Equations

[tex]F_{net}[/tex]=ma

[tex]F_{g}[/tex]=mg

## The Attempt at a Solution

I used [tex]F_{net}[/tex]=[tex]F_{g}[/tex]+[tex]F_{F}[/tex] and substituted in the values, but I don't seem to get the correct answer.

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